I used all the steps mentioned in getting started guide: https://www.pulumi.com/blog/easy-ai-apps-with-langserve-and-pulumi/ My qustion is ho much ill I be charged if type "yes" after pulumi up?

Please don't quote me on this but my educated guess is that you will be charged based on how many resources it creates and are active afterward.

Should be however long you let Fargate run. Pinecone index should be within free tier.

Unless you leave it running for a long time, I can’t imagine AWS charges will be very much at all.